Electrically heated mat



Aug. 23, 1932. G. KNOPF ELECTRICALLYl HEATED MAT Filed Jan. 3l. 1951 71,14 in 'I Snom/tez pfirude Hna/4f Patented Aug. 23, 1932 GERTBUDE Knorr, lor BYE, NEW Yom:

ELECTRICALLY HEATED MAT Application led .Tan-nary 31, 1981. Serial No. 512,581.

This invention relates to improvements in electric heating devices, and it is the principal object of my invention to provide an electrically heated foot pad in a moisture.

b proof cover to keep the feet of the user warm and dry.

Another object of my invention is the provision of a foot pad or mat readily transported and placed for use in non-heated l rooms which for one or .the other reason cannot be properly warmed tokeep the feet of automobiliste, fliers, desk workers, store kee ers, etc., warm and dry.

et another object of my invention is thek l provision of a foot mat of coco fibre or the like, having throughoutv the center of its strand means for heating the mat electrically.

A further. object of my invention is the provision of an electrically heated foot mat or pad of simp-le'and inexpensive construction, yet durable and highly efiicient in use.

These and other objects and advantages of my invention ,will become more fullyknown as the description thereof proceeds and will then be specifically defined in the appended claims.

In the accom anying drawing forming a material part o this disclosure:

Fig. 1 is a top plan view of an electrically 3" heated foot pad constructed according to my invention. Fig. 2 is a sectionon line 2-L2 of Figure 1.

Fig. 3 is a fragmentary detail view illustrating the construction of the strands form- 5 ing the pad.

As illustrated the pad is composed of an asbestos core, 11 about which is wound in aI v pluralityof convolutions a resistance wire 15. The resistance wire 15 is wound about the 4" inner core 11 and is surrounded by an outer cover or coating 16 insulated therefrom as at 16 and vof a material impervious Ito humidity as for instance coco fibre. The entire strand is wound about itself in a plurality of convolutions to form an outer margin or frame 12 and inner sections 13 preferably formed by substantially triangular elements 14. The ends of the resistance wire are connected to the strands of a cable 18 held in position by a plate 17 one corner of the pad, said strands being connected to any source of electricity in the well known manner.

The operation of my device will be entirely clear from the above description and-simultaneous inspection of the drawing, and it will be evident that upon connectionof the wire in the mat with a source of electricity, the mat will be heated while protected against humidity, and will tend to keep the feet of users at al1 times warm and dry. The strands 60 forming the frame of the mat are sewed together as at 19 and 20, and the inner substantially triangular elements are sewed together as for instancel at 21 to hold the strands firmly in their place and to prevent their un- 05 coiling and becoming entangled when moved from one place to another.

It will be understood that I do not desire to be limited to the exact construction disclosed, but may make such changes in the construction of the mat as come Within the scope of the appended claims without departure from the spirit of my invention. Having" thus described my invention what I claim as new anddesire to secure by Letters Patent is:

. An electric heating pad or mat formed of a continuous strand comprising an inner core, resistance wire wound about said core, and

anouter water proof inculating cover formed with said strand, a plate for holding a cable connected to a source of eleotriclty, said strand being then guided and firmly held in a. plurality of parallel convolutions to form a substantially elongated frame or outer mar- S5 gin and then formed into and firmly held in a plurality of substantially triangular convolutions or elements arranged in juxtaposition within said outer margin, the strands of said cable connected to the end of said pad strand. In witness whereof I have signed my name to this specification.

GERTRUDE KNOPF. 

